Corn ruler



FIG. 1 is a front view of a corn ruler showing my new design;

FIG. 2 is a rear view of the corn ruler;

FIG. 3 is a right side view of the corn ruler;

FIG. 4 is a left side view of the corn ruler;

FIG. 5 is a top view of the corn ruler;

FIG. 6 is a bottom view of the corn ruler; and,

FIG. 7 is a top front side perspective view of the corn ruler.

The cutaway symbols illustrated in broken lines in the drawings indicate a symbolic break in the length of the design for the corn ruler. The appearance of any portion of the article between the break lines forms no part of the claimed design. 

CLAIM The ornamental design for a corn ruler, as shown and described. 